How many PC I can set up Photoshop with Photography Plan?

you can install the cc desktop app from here https://creative.adobe.com/products/creative-cloud on as many (mac and/or win) computers as you own and use it to install all (or some, if you want) of your cc subscription programs.

the only (insignificant for internet connected computers) limitation is that you can sign-in (and therefore start your adobe programs) on, at most, two computers at any one time.

because you can sign out from either (or both) signed-in computers using a 3rd computer, this could not (imo) be easier.

https://helpx.adobe.com/download-install/using/install-apps-number-of-computers.html

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/ 

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